Metal corner bead for dry wall construction



Feb. 16, 1943.

w. MITCHELL METAL CORNER BEAD FOR DRY WALL CONSTRUCTION Filed 001;. 3,1941 Q U. B-MITCHELL,

Patented Feb. 16, 1943- METAL CORNER BEAD FOR DRY WALL CONSTRUCTIONWiley B. Mitchell, Wichita, Kans., assignor of thirty per cent to F. N.Masemore, Wichita,

Kans.

Application October 3, 1941, Serial No. 413,556

2 Claims.

This invention relates to dry wall construction, and more particularlyto the use of a corner bead in connection therewith.

According to the preferred embodiment of my invention the corner beadcomprises a metal strip which is doubled on itself along a longitudinalline to form two portions connected by a bead, one of the strip portionsbeing then bent to form an outstanding flange extending substantially atright angles to the other portion or flange. Each portion of the stripis provided with suitable perforations of relatively large size for thepassage of cement and also with smaller openings for nails or otherfastening means.

One of the difiiculties heretofore encountered in connection with drywall construction corners has been a tendency to crack; therefore, theimprovement must not only furnish a rigid corner which will preventchipping when the corner is struck by blows, but also will hold the twosheets of plaster board together. Basically, that is done in two ways:First, a series of nails driven through, in the case of one flange,first the flange of the corner head then the plaster board into thestudding, and inthe case of the other flange, through first the plasterboard then the flange of the corner bead and finally the studding.Second, the cement which is designed for the purpose of making a tiebetween the two sections of plaster board should be Perfatape or similarmaterial. The cement is not only used to fill the holes through thebead, but is put on top of the flange of the bead which goes over theplaster board and is trowelled down to a feather edge, thereby coveringthe metal and the nails.

An important feature of the bead is the fact that it furnishes not onlya rigid edge, but serves as a support for a plaster tie between the twopieces of Sheetrock or other plaster material; that is, the holes in thecorner bead permit plaster to extend from the edge of one piece ofSheetrock directly across to the edge of the other and prevent cracking,a dimculty which has always been considerable of a problem in dry wallconstruction.

The corner bead is designed to be used in conjunction with Sheetrock orsimilar dry wall material, one flange of the corner bead beingunderneath one section and on top of another section. In proper use, alittle space of to A of an inch is left between the bead and theSheetrock, and this space is filled with Perfatape or similar cement toprevent cracking at the juncture of the bead and the Sheetrock.

The invention will be more readily understood by reference to theaccompanying drawing in which:

Fig. 1 is a perspective view of a portion of the improved corner bead orstrip.

Figs. 2, 3 and 4 are actual views illustrating successive steps inconnection with two plaster boards, Fig. 4 being a section on line 4-4of Fig. 7.

Figs. 5 and 6 are similar views illustrating the use of the strip inconnection with a single plaster board.

Fig. 7 is a front elevation partly broken away showing the corner stripapplied to a dry wall construction.

Referring to the drawing the reference character A denotes a metal stripwhich is then bent along a center line to form two halves [0, ll,connected by a hollow tube portion or bead I2. 20 While the two halves land l l are in contact a series of large openings l3 and I4 for passageof cement and a series of smaller openings 20 and 2| for nails or otherfastenings are punched out. After the holes l3, I4, 20 and 2| have beenpunched out, the outer portion of strip II is then bent away from thestrip l0 along a line I so as to form a flange I6 extending at rightangles to the remaining portion I! of the strip II and to the strip Ii),vthe outer portion I8 of which is exposed and may also be termed aflange. Where the corner strip is designed to be used in connection withan arch suitable cuts Ill-I9 are made in the flange I6 connecting' theouter edge thereof with the apertures I4 as best shown in Fig. '7.

The method of using the strip in connection with two plaster boards isillustrated in Figs. 2, 3 and 4. In those figures the reference numeral22 denotes suitable studding and the reference numeral .23 a strip ofplaster board or Sheetrock. The corner strip is applied as indicated inFig. 2 with a flange l8 secured to the plaster board by means of nails24 passing through openings and extending into the studding. 45 Theflange I6 is secured directly to the studding by means of nails 25passing through nail holes 2|. It will be noted that the end of theplaster board is spaced slightly from the flange l6 of the corner beadas indicated at 29. A second 50 plaster board 26 is then secured overthe flange [6 as illustrated in Fig. 3 and is secured in place by nails2'! which pass through the plaster board of the flange l6 and thestudding 22 as indicated in Fig. 3.

Cement is then applied as indicated in Fig. 4,' t

the cement covering the nails or other fastening means and extendingthrough the openings l3 into the space 29 and at least partially fillingthe openings M. l

In Figs. 5 and 6 the use of the strip with one plaster board 26'extending at right angles to the studding 22 is illustrated. In thiscase the flange I8 is secured directly to the studding 22' by means ofnails or other fastenings 24 and the plaster board 26 is secured to thestudding by means of through the plaster board, the flange I6 into thestud-ding 22'. A finishing layer of cement 28' is then applied as shownin Fig. 6 and is described in connection with Fig. 4.

Where the corner strip is to be used in connection with an arch or thelike the cuts [9 in the flange [6 allow the corner bead to be curved asillustrated in Fig. '7.

While the corner strip may be of any desired size or dimensions, I havefound it convenient to form the bead from a blank initially about threeinches across so that when bent upon itself the strip NJ and H areapproximately 1%; inches wide. The flanges l6 and I8 are eachapproximately 1 inch wide. The openings l3 and M in the flanges l8 andI6 respectively being directly opposite each other permitting theplaster or cement to tie across from one piece of Sheetrock to theother. These openings come to within /2 inch of the outer edge of thebead 12.

For preferred use the edges of the Sheetrock strips 23 and 21 havesufiicient clearance to permit access of mortar. The nailspass throughboth the Sheetrock and the bead into the studding, and these togetherwith the bead itself and the mortar tie, make a corner which cannot bebroken or chipped and which will not crack or break with changes intemperature or settling.

The invention has been described in detail for the purpose ofillustration but it will be obvious that variations and modificationsmay be resorted to without departing from the spirit of the invention.

I claim:

1. A dry wall construction comprising a stud- [l0 nails or otherfastening devices 21 passing,

ding, a plaster board extending at right angles thereto, and a cornerbead composed of a double metal strip having a bead portion and a pairof flanges formed integral therewith and extending 5 at right angles toeach other, one flange being secured direct at the studding and theother being secured tothe studding through said plaster board, one ofsaid flanges bein interposed between the plaster board and the studding;said flanges having cement receiving openings therein, and cementfilling said openings, the end of said plaster board terminating shortof the corresponding flange, leaving a space therebetween, and a layerof cement extending through said openings into said space and coveringthe exposed portions of said corner bead.

2. A dry wall construction comprising a studding and two sheets ofplaster board secured to the studding at right angles to each other bymeans of a corner bead, said corner bead comprising a strip of metaldoubled along a longitudinal center line, having a bead at the foldedover portion and an out turned flange extending at right angles to theremainder of the strip, both portions of the doubled strip beingprovided with large cement receiving openings, and with smaller nailopenings, one portion of said strip overlapping the outer face of one ofthe plaster boards and the out turned flange being interposed 30 betweenthe studding and the inner face of the other plaster bead, fasteningmeans securing the parts together, one set of fastening means passingfirst through one flange of the corner bead, then through one sheet ofplaster board and thence into the studding, and the other passingsuccessively through the other sheet of plaster board, the out turnedflange of the corner bead, and then through the studding, the ends ofsaid plaster board sheets terminating short of said flanges, leavingspaces therebetween, and a layer of cement extending through saidopenings into said spaces, and covering the exposed portions of saidcorner beads and heads of said fastening means.

WILEY B. MITCHELL.

